1. History and challenges surrounding ovarian stimulation in the treatment of infertility 
Stephanie A. Beall, M.D., Ph.D., Alan DeCherney, M.D. 
Fertility and Sterility 
Volume 97, Issue 4, Pages (April 2012)
DOI: /j.fertnstert
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2. Figure 1
Rates of live birth, twin pregnancy, and high-order multiple pregnancy in women undergoing IVF, 1997–2009, according to the US Centers for Disease Control and Prevention National Summary and Fertility Clinic Report (39).
Fertility and Sterility  , DOI: ( /j.fertnstert )
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3. Figure 2
United States Centers for Disease Control and Prevention national birth data, 1990–2009 (40).
Fertility and Sterility  , DOI: ( /j.fertnstert )
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